Submission #1015872

#	Time	Username	Problem	Language	Result	Execution time	Memory
1015872		12345678	Zagrade (COI20_zagrade)	C++17	14 / 100	689 ms	344 KiB

zagrade

#include <bits/stdc++.h>

using namespace std;

const int nx=1e3+5;

int n, res[nx], x, q;

int query(int l, int r)
{
    cout<<"? "<<l<<' '<<r<<'\n';
    fflush(stdout);
    cin>>x;
    return x;
}
void solve(int l, int r)
{
    if (r<l) return;
    if (r==l+1) return res[l]=1, void();
    for (int i=l+1; i<r; i++) if (((i-l+1)%2)==0&&query(l, i)) return solve(l, i), solve(i+1, r), void();
    res[l]=1;
    solve(l+1, r-1);
}

int main()
{
    cin>>n>>q;
    solve(1, n);
    cout<<"! ";
    for (int i=1; i<=n;i ++) cout<<(res[i]?'(':')');
}

• Subtask 1: 14 / 14
• Subtask 2: 0 / 7
• Subtask 3: 0 / 57
• Subtask 4: 0 / 22